US 12,135,510 B2
Developing apparatus
Tomoyuki Sakamaki, Toride (JP); and Mitsuhiro Furukawa, Kawaguchi (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Dec. 21, 2022, as Appl. No. 18/085,827.
Application 18/085,827 is a division of application No. 17/570,641, filed on Jan. 7, 2022, granted, now 11,567,426.
Application 17/570,641 is a division of application No. 17/083,499, filed on Oct. 29, 2020, granted, now 11,243,483, issued on Feb. 8, 2022.
Application 17/083,499 is a division of application No. 15/646,324, filed on Jul. 11, 2017, granted, now 10,852,661, issued on Dec. 1, 2020.
Application 15/646,324 is a division of application No. 14/382,404, granted, now 9,760,037, issued on Sep. 12, 2017, previously published as PCT/JP2013/062880, filed on Apr. 26, 2013.
Claims priority of application No. 2012-103804 (JP), filed on Apr. 27, 2012.
Prior Publication US 2023/0195006 A1, Jun. 22, 2023
Int. Cl. G03G 15/08 (2006.01); G03G 15/09 (2006.01)
CPC G03G 15/0812 (2013.01) [G03G 15/0818 (2013.01); G03G 15/09 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A developing apparatus for developing a latent image formed on an image bearing member comprising:
a developer carrying member configured to carry a developer including toner and magnetic carrier, said developer carrying member including a developer carrying surface having a plurality of grooves;
a magnet, provided inside said developer carrying member, configured to attract the developer on said developing carrying surface; and
a regulating member, provided spaced from said developer carrying member, configured to regulate an amount of the developer carried on said developer carrying surface,
wherein an amount M/S (mg/mm2) of the developer carried on a unit area of said developer carrying surface after passing by said regulating member, a gap SB (mm) between a free end of said regulating member and said developer carrying member, a depth D (mm) of said grooves, a density G (mg/mm3) of the developer, and a groove ratio α which is a ratio of said grooves in said developer carrying surface satisfy,
0.1≤M/S (mg/mm2)≤0.5,
0.2≤SB (mm),
¼×M/S (mg/mm2)≤α×{SB(mm)+D(mm)}×G(mg/mm3)<M/S (mg/mm2),
0.06≤α
wherein said magnet includes a pole at a position opposing said regulating member, and
wherein the pole is in a range of 40 mT to 70 mT in magnetic flux density.